When Green Day worked in a chant of "No Trump! No KKK! No fascist U.S.A.!" into their performance at the 2016 American Music Awards, it became one of the most talked-about moments of the ceremony, one in line with the spark of their own politically charged American Idiot.

They performed the same song, "Bang Bang," on The Late Late Show with James Corden Monday night (November 22), and opened up to the host about why they addressed the president-elect from their stage.

"We didn't rehearse it," singer Billie Joe Armstrong told Corden. He mentioned that the origin of the chant came from another band, MDC, and that they were — no shocker here — floored by the election results. "We're just as much in shock as everybody else is about this, but, I think with the AMAs, for us, it was a good start to challenge him about all his ignorant policies and racism."

American Idiot, their 2004 album that saw success as a fully staged musical in 2010 (and will soon see the small-screen treatment on HBO), was written as a response to their dissatisfaction with George W. Bush's presidency.

Would they feel compelled to write one about Trump's? Corden broaches the subject, and Armstrong chuckles before saying that if they did, it'd likely be called The Morning After.